Improvement in devices for locking-nuts



THOMAS W. K'IRKWOOD.

Improvement in Devices for Locking Nut s No. 125,309 PatentedAprH2J872.

ATENT QFFICE.

THOMAS W. KIRKWOOD, OF MOKEESPORT, PENNSYLVANIA.

Specification forming part of Letters Patent No. 125,309, dated April 2,1872.

Specification describing a Bolt-Fastener for Fish-Plates, invented byTHOMAS W. KIRK- WooD, of McKeesport, in the county of Allegheny andState of Pennsylvania.

The invention will first be fully described, and then clearly pointedout in the claim.

In the drawing, Figure 1 is a side elevation, Fig. 2 a cross-section ofthe rail.

A A represent the two rails which are to be jointed together in line; B,one of the fishplates; 0, the bolt-head; and D, the lockplate. Thisplate D has two long slots, d d, each of which is intended to receivethe pair of bolt-heads which fasten to one rail; has a middle piece, (1which covers the junction of rails and strengthens the plate, and has asmall perforation, d at each end. The fishplate Bis provided with endslots 1; I), through which pass the rivets E E. By this construe tionthe rivets are placed with their heads against the rail, while theirshanks pass up through end slots b I) of the fislrplate and theperforations d d of the boltlock. The protruding ends of these rivetsare then upset and turned down on the face of the lock-plate. Thisfastens the lock-plate D and fish-plate B The bolt-heads, (after theyrigidly together.

have been screwed up,) being inclosed on two sides by the lockplate,cannot turn. These bolts are preferably end threaded, passed through therails, and screwed into the opposite fish-plate. When it is founduponexamination that the nuts require tightening up, the workman simplycuts off the rivet-head, removes the lock-plate, tightens the bolts,pushes out the old rivets through the end slots 1) b, replaces thelatter with new ones, and passes on.

It will be perceived that there is no necessity whatever for removingthe fish-plate in order to get out the old rivet. Of course this deviceis equally as applicable to nuts as to bolt-heads.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is- V The combination of lock-plate D havingend perforations d 01 and the fish-plate B having end slots b b, withrails A A, as and for the purpose described.

T. W. KIRKW'OOD.

Witnesses:

SoLoN O. KEMON, Trros. D. D. OURAND.

